Bug 1536606

Summary:	Stopped animators are not removed / Constant screen repaints after display configuration is changed in KDE Plasma 5
Product:	[Fedora] Fedora	Reporter:	ValdikSS <iam>
Component:	qt5-qtdeclarative	Assignee:	Rex Dieter <rdieter>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	27	CC:	jgrulich, jreznik, rdieter, than
Target Milestone:	---
Target Release:	---
Hardware:	x86_64
OS:	Linux
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Fixed In Version:	qt5-qtdeclarative-5.9.2-3.fc27	Doc Type:	If docs needed, set a value
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Clone Of:		Environment:
Last Closed:	2018-01-23 21:48:38 UTC	Type:	Bug
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Embargoed:

Description ValdikSS 2018-01-19 17:50:00 UTC

Description of problem:
The screen starts to repaint multiple times a second if display configuration is changed in KDE Plasma 5, causing excessive GPU load, slowdowns, and higher temperature than expected.

This is due to qt5-qtdeclarative bug, which is fixed in commit http://code.qt.io/cgit/qt/qtdeclarative.git/commit/?id=6990ae6c1bad32952e371fa72bee65a7af11c313


Version-Release number of selected component (if applicable):
qt5-qtdeclarative-5.9.2-2.fc27.x86_64


How reproducible:
100% of the time


Steps to Reproduce:
1. Boot KDE without external display connected.
2. Activate "Show Paint" kwin effect to see screen repaints. Notice that the screen does not get repainted if there are no updates on the screen.
3. Connect external display, configure it to be the only active display using KDE display configurator.
4. The screen start to flash because of excessive repaints.
5. Disconnect external display cable and switch to laptop display. The screen still flashes because of repaints.

Actual results:
GPU and CPU load is as usual

Expected results:
GPU and CPU load is higher than expected


Additional info:
See https://bugs.kde.org/show_bug.cgi?id=388759

Comment 1 Rex Dieter 2018-01-19 20:03:03 UTC

I'll backport the fix (so we don't have to wait for 5.9.4)

Comment 2 ValdikSS 2018-01-19 20:10:47 UTC

It clearly applies to current Fedora 27 Qt5 5.9.2 version.

Comment 3 Rex Dieter 2018-01-19 20:18:46 UTC

%changelog
* Fri Jan 19 2018 Rex Dieter <rdieter> - 5.9.2-3
- branch backport: Stopped animators are not removed (#1536606,kde#388759)

f26/f27 builds underway

Comment 4 Fedora Update System 2018-01-19 20:56:00 UTC

qt5-qtdeclarative-5.9.2-3.fc27 has been submitted as an update to Fedora 27. https://bodhi.fedoraproject.org/updates/FEDORA-2018-8d1dd6043e

Comment 5 Fedora Update System 2018-01-19 20:56:43 UTC

qt5-qtdeclarative-5.9.2-3.fc26 has been submitted as an update to Fedora 26. https://bodhi.fedoraproject.org/updates/FEDORA-2018-61e0dcaf5e

Comment 6 Fedora Update System 2018-01-21 09:44:07 UTC

qt5-qtdeclarative-5.9.2-3.fc26 has been pushed to the Fedora 26 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-61e0dcaf5e

Comment 7 Fedora Update System 2018-01-21 10:41:22 UTC

qt5-qtdeclarative-5.9.2-3.fc27 has been pushed to the Fedora 27 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-8d1dd6043e

Comment 8 Fedora Update System 2018-01-23 21:48:38 UTC

qt5-qtdeclarative-5.9.2-3.fc27 has been pushed to the Fedora 27 stable repository. If problems still persist, please make note of it in this bug report.

Comment 9 Fedora Update System 2018-01-28 21:15:23 UTC

qt5-qtdeclarative-5.9.2-3.fc26 has been pushed to the Fedora 26 stable repository. If problems still persist, please make note of it in this bug report.